How to install java8 using homebrew

Install java8

$ /usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$ brew tap caskroom/versions
$ brew cask install adoptopenjdk/openjdk/adoptopenjdk8

Select java8

$ /usr/libexec/java_home -V
$ export JAVA_HOME=`/usr/libexec/java_home -v 1.8`